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  $01/1:   6510 On-chip 8-bit Input/Output Register

   +----------+---------------------------------------------------+
   | Bits 7-6 |   Undefined                                       |
   | Bit  5   |   Cassette Motor Control (0 = On, 1 = Off)        |
   | Bit  4   |   Cassette Switch Sense: 1 = Switch Closed        |
   | Bit  3   |   Cassette Data Output Line                       |
   | Bit  2   |   /CharEn-Signal (see <A HREF="MEMCFG.HTM">Memory Configuration</A>)       |
   | Bit  1   |   /HiRam-Signal  (see <A HREF="MEMCFG.HTM">Memory Configuration</A>)       |
   | Bit  0   |   /LoRam-Signal  (see <A HREF="MEMCFG.HTM">Memory Configuration</A>)       |
   +----------+---------------------------------------------------+
   Default Value is $37/55 (%00110111).

  (German-?)C128 only:

   +--------+-----------------------------------------------------+
   | Bit  6 |   ASCII/DIN-Switch (0=DIN, 1=ASCII)                 |
   +--------+-----------------------------------------------------+
   Default Value is $77/119 (%01110111).

  Flash_8 only:

   +--------+-----------------------------------------------------+
   | Bit  7 |   1 = 1 MHz, 0 = 8 MHz (if DIP1 closed)             |
   | Bit  6 |   (?)                                               |
   +--------+-----------------------------------------------------+
   Default Value is $37/55 (%00110111).

Kernal-Reference:

 ASL $01,X   : <A HREF="ROMB983.HTM">$B9A6</A>
 BIT $01     : <A HREF="ROMF82E.HTM">$F830</A> <A HREF="ROMF82E.HTM">$F834</A>
 INC $01,X   : <A HREF="ROMB983.HTM">$B9AA</A>
 LDA $01     : <A HREF="ROMEA31.HTM">$EA61</A> <A HREF="ROMEA31.HTM">$EA6B</A> <A HREF="ROMEA31.HTM">$EA75</A> <A HREF="ROMF875.HTM">$F8AB</A> <A HREF="ROMFBA6.HTM">$FBBF</A> <A HREF="ROMFCCA.HTM">$FCCA</A>
     $01,X   : <A HREF="ROMF5DD.HTM">$F5E6</A>
     $0001,Y : <A HREF="ROMB867.HTM">$B8CB</A>
 LDY $01,X   : <A HREF="ROMB983.HTM">$B991</A>
 LSR $01,X   : <A HREF="ROMB867.HTM">$B89E</A>
 ROR $01,X   : <A HREF="ROMB983.HTM">$B9AC</A> <A HREF="ROMB983.HTM">$B9AE</A>
 SBC $01,X   : <A HREF="ROMB867.HTM">$B8CE</A>
 STA $01     : <A HREF="ROMEA31.HTM">$EA79</A> <A HREF="ROMF875.HTM">$F8AF</A> <A HREF="ROMFBA6.HTM">$FBC3</A> <A HREF="ROMFCCA.HTM">$FCCE</A> <A HREF="ROMFDA3.HTM">$FDD7</A>
     $01,X   : <A HREF="ROMB4D5.HTM">$B4DB</A>
 STY $01,X   : <A HREF="ROMB983.HTM">$B997</A>

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